of saving lives and racing against the clock. >> oh, yes. >> one of my favorite anecdotes was denton cooley. >> there was no fda for a long time when cooley was operating, and trying to figure out which way i want to tell this story. i had heard a lot of very strange store about this doctors doing interesting things we would not find normal today, and i kept hearing this story and i had a wonderful source who helped me, an editorial -- a medical writer by training traid worked if always these doctors and i said i know i've asked you a lot of stupid questions but i have to ask you, this is really stupid, but if it's true i want to write about it and i said, i keep hearing this story that denton cooley but a cow's heart in a patient, and she didn't misa beat and said, no, i it was a sheep's heart and he was in the operating room, it was before transplants were successful, he had run out of options and the patient was dying on the table, and he turned to somebody and said go down to the lab, bring me a sheep's heart. let's try it. and somebody went down, they had lab animals, they cut a heart